body,
div,
span,
header,
footer,
nav,
section,
aside,
article,
ul,
dl,
dt,
dd,
li,
a,
p,
h1,
h2,
h3,
h4,
h5,
i,
b,
textarea,
button,
input,
select {
    padding: 0;
    margin: 0;
    list-style: none;
    font-style: normal;
    text-decoration: none;
    border: none;
    
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    font-weight: lighter;
    
    -webkit-tap-highlight-color: transparent;
    &:focus {
        outline: none;
    }
   
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none !important;
    margin: 0;
}

html {
    height: 100%;
    width: 100%;
    background-color: #f2f2f2;
}
body{
    font-size: 28px;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC","Helvetica Neue",STHeiti,"Microsoft Yahei",Tahoma,Simsun,sans-serif;
    color: #313131;

}

.clear:after {
    content: '';
    display: block;
    clear: both;
}

.clear {
    zoom: 1;
}

.back_img {
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.margin {
    margin: 0 auto;
}

.left {
    float: left;
}

.right {
    float: right;
}

.hide {
    display: none;
}

.show {
    display: block;
}